Insulator-pin-centering means



Oct 14, 1930. K. A. HAWLEY INSULATOR PIN CENTERING MEANS Filed Jan. 7, 1927 Patented Get. 14, 1930 KENT A. HAW'LEY, OF BALTIMORE, MABYLAI'ID, ASSIGNGB TO LOOKE COR- PORATION, OF BALTIMQRE, MARYLAND, USE; ERATION OF MARYLAND INSULATGR-PIN{IEHTEEING MEANS Application filed. January 7, 182?.

The invention relates to insulators, particularly those of that type having a pin secured therein in axial relation thereto.

It is well known that in insulators or the suspension type the pin, which may be 01 any particular variety depending upon the character of the contemplated connection between successive units, is cemented within a recess or socket in the porcelain body. In some instances the wall of the socket or recess is sanded so as to insure proper holding action of the cement which fills the recess and which embeds the pin therein. It has been discovered that cement is flexible to a limited extent and is an important medium for the distribution of the loadings between the metal and porcelain parts or" insulators. If the cement mass is too thin at any point or points concentrated loads result. in order to have a proper thickness oi cement between the pin and wall of the socket or recess it has been proposed to make the pin hole of considerably larger diameter than the pin head, the space being of course filled with cement to embed the head. Bin objection to this has been that the pin may frequently be assembled in the insulator eccentrically of the pin hole, the result being that the mass of cement is too thick at some points and too thin at others, th consequently causing the bringing of un equal stresses strains at difierent points instead of the entire load being uniformly distributed. it then becomes of importance to provide means whereby the pin may be comparatively accurately centered with respect to the recess or hole provided for its accommodation.

It is with the above facts in view that have designed the present invention which has for its object the overcoming of this diiiiculty by the provision or means cooperating with the pin for centering it.

An important object is to provide centerin means of this character which forms part or the insulator body itself instead of consisting of an auxiliary or entraneous device.

A more specific object is to provide centering means of this character which may consist simply of a recess or depression at the closed end of the pin hole, this depression be- 1 Ill 11 :1 Lori ,mnyt n and additi iete insulate Serial lTo. 159,599.

e of s ep h to accommodate pr vided on the pin ther the cushion be 'tal le cushioning gasket. ---ct is the provision of his character which will i production of the comwhich will not involve in the manufacture, the mently simo to carry the emciency of to toe co the insulator.

vantages in the above and other objects and ad new, the invention preferably consists in th detailed structure to be herein- F gure 1 insulator o":

L 1. i s aiioaid type snowing it is a cross sectional view through equipped with '1 v nvention and showing the polls 1 position,

is a similar view but showing the l invention applied to an insulator in which the pin hole is grooved instead of sanded.

Referring more particularly to the drawan in and especially Figure l, the numeral 1 designates, generally, the porcelain body i Oi sulator here disclosed as of the sustype and including a skirt portion 2 on the center of which extends a stem 3 rmed with hole socket l opening out 5 the underside oi the insulator for the reception or" the pin 5. The stem 3 is adapted to have secured thereto a cap, not shown, and the cap well the pin may be of the clevis,

ball and the part socket or other type depending upon icular form of connection desired for a series or" units to make a string or chain. in the drawing the insulator is of course shown in inverted position inasmuch it is pla the pin tomary.

or hole is sanded as indicated so as to provide tion of for insuring the proper gripping acthe cement 6 which embeds the pin head '7 within the hole. The pin head is here disclosed as having two steps though it should be distinctly understood that it may have as few as one or as many more than two as desired, this detail being immaterial.

As mentioned above, itis desirable to provide an appreciable space between the pin and the wall of the hole or socket so that the of cement embedding the pin will have su'tlicient thickness to distribute the loads properly. To insure centering of the pin so that the space between it and the wall will be at least substantially uniform throughout, I provide a depression or recess 8 at the closed end of the hole or socket, this recess being of substantially the same diameter asthe pin head so as to receive the same and consequently maintain the pin in coaxial relation to the insulator body. It is generally customary to pro ride a cushion at the end of the pinhead and in someinstances this cushion is simply a coating of asphaltum. fowever, the better practice is to equip the pin head with a disk 9 of paper, rubberoid or other suitable material, and in view of this practice it is intended that the recess or depression 8 be of sufficient depth to receive this cushion or gasket and to permit the end of the pin head also to enter. It might of course be possible to make the recess very shallow as it would still have its centering action upon the pin even though it received only the gasket or cushion for the reason that the cushion is secured to the pin head by a suitable adhesive and is incapable of move ment with respect thereto.

In Figure 2 the same arrangement is dis closed except that the Wall of the pin receiv ing socket or hole is not sanded but is pro- :vided with alternating ribs and grooves 10 and 11 respectively for insuring proper holding action of the cement. The recess is provided inexactly the same manner and per forms the same function as in the first 'described form.

The pin is of course assembled with respect to the porcelain body in the usual manner it being, however, clear that it will be effectually centered so that its axis will coincide with that of the porcelain body, eccentricity and consequent. development of unequal strains in service being eliminated. It is believed thatthe construction, operation and advantages will be readily apparent to one skilled in the art without further explanation. I

While I have shown and described the preferred embodiments of the invention, it should of course be understood that there is no restrictionas to the type of insulator or pin or any other limitations except in so far a socket therein, and a pin having a head of less diameter than the socket adapted to be cemented within the socket, the dielectric body being formed with a recess at the end of the socket and communicating therewith, said recess having a flat wall and being of substantially the same diameter as the pin head and adapted to receive the same i'or centering the pin with respect to the dielectrio body. v

2. In an insulator, a dielectric body having a socket therein, and a pin having a head adapted to be cemented Within the socket, the dielectric body being formed with a recess at the end of the socket and communicating therewith, said recess being of less diameter than the socket and of sub stantially the same diameter as the pin head and adapted to receive the same for centering the pin with respect to the dielectric body, the pin having a cushion fast on the end of its head, and said recess having a fiat wall and being of a depth SllfllClGIlt to accommodate at least the cushion.

In testimony whereof I affix my signature.

KENT A. HAWLEY; 

